Hypocrisy is the most difficult and nerve-racking vice that any man can pursue; it needs an unceasing vigilance and a rare detachment of spirit. It cannot, like adultery or gluttony, be practiced at spare moments; it is a whole-time job

Be not intimidated, therefore, by any terrors, from publishing with the utmost freedom whatever can be warranted by the laws of your country; nor suffer yourselves to be wheedled out of your liberty by any pretenses of politeness, delicacy, or decency. These, as they are often used, are but three different names for hypocrisy, chicanery, and cowardice.

Oh Jesus, they have built these churches for the sake of their own glory, and embellished them with silk and melted gold. . . . They left the bodies of Thy chosen poor wrapped in tattered raiment in the cold night. . . . They filled the sky with the smoke of burning candles and incense and left the bodies of Thy faithful worshipers empty of bread. . . . They raised their voices with hymns of praise, but deafened themselves to the cry and moan of the widows and orphans. Come again, Oh Living Jesus, and drive the vendors of Thy faith from Thy sacred temple, for they have turned it into a dark cave where vipers of hypocrisy and falsehood crawl and abound.

What makes it so plausible to assume that hypocrisy is the vice of vices is that integrity can indeed exist under the cover of all other vices except this one. Only crime and the criminal, it is true, confront us with the perplexity of radical evil; but only the hypocrite is really rotten to the core.

Hannah Arendt:

For neither man nor angel can discern Hypocrisy, the only evil that walks
Invisible, except to God alone.